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PHP Resource Exhaustion Denial of Service
From: full-disclosure () lists netsys com (Kurt Seifried)
Date: Wed, 24 Jul 2002 00:57:56 -0600
Perhaps you could put this on a site that is available? I have had no luck accessing http://www.murphy.101main.net/php-apache.c. Alternatively if you could email it to me I would appreciate it. Kurt Seifried, kurt () seifried org A15B BEE5 B391 B9AD B0EF AEB0 AD63 0B4E AD56 E574 http://seifried.org/security/ ----- Original Message ----- From: "Matthew Murphy" <mattmurphy () kc rr com> To: "BugTraq" <bugtraq () securityfocus com>; "SecurITeam News" <news () securiteam com>; "Full Disclosure" <full-disclosure () lists netsys com> Sent: Saturday, July 20, 2002 7:45 PM Subject: [Full-disclosure] PHP Resource Exhaustion Denial of Service
The PHP interpreter is a heavy-duty CGI EXE (or SAPI module, depending on configuration) that implements an HTML-embedded script language. A vulnerability in PHP can be used to cause a denial of service in some
cases.
PHP's install process on Apache requires a "/php/" alias to be created, as it resolves CGI paths to a virtual. (e.g, /php/php.exe not
C:\php\php.exe).
To solve the obvious security vulnerability posed by allowing PHP to run from the web, the development team added a cgi.force_redirect option that
is
enabled by default in Apache. However, regardless of the force_redirect value, it is still possible to load the binary without a script path: (e.g, http://localhost/php/php) A problem exists in PHP; specifically, it does not terminate when given no command-line arguments. A consistent flow of requests like the above will exhaust all resources for CGI/ASAPI on the server. Exploit: http://www.murphy.101main.net/php-apache.c I tried to make sure this would run on Linux/BSD, but no guarantees... Compiles cleanly on WinMe with MSVC 6.0. _______________________________________________ Full-Disclosure - We believe in it. Full-Disclosure () lists netsys com http://lists.netsys.com/mailman/listinfo/full-disclosure
Current thread:
- PHP Resource Exhaustion Denial of Service Matthew Murphy (Jul 20)
- PHP Resource Exhaustion Denial of Service Kurt Seifried (Jul 23)